I am sitting with a philosopher in the garden; he says again and again 'I know that that’s a tree', pointing to a tree that is near us. Someone else arrives and hears this, and I tell him: 'This fellow isn’t insane. We are only doing philosophy.
Logic is not a body of doctrine, but a mirror-image of the world. Logic is transcendental.
The world is the totality of facts, not of things.
Whereof one cannot speak, thereof one must be silent.
Our greatest stupidities may be very wise.
If people never did silly things nothing intelligent would ever get done.